PDF malware analysis — malicious · 852d9c357efad2e3

MALICIOUS

PDF

37.6 KB Created: 2020-09-04 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e58025d455f574e85f58168657e1bd5b SHA-1: 6fa5c9776daf3e4e73154185c1747f96e2f9e275 SHA-256: 852d9c357efad2e3fe2276f76885b165d7d3728b0c7b77431a8ce8c19c3a37be

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL. The presence of numerous external PDF links, some pointing to benign content and others to the redirector, suggests a link farm or a method to obscure the final malicious destination. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.com/wix?keyword=careless+whisper+note+sheet
- https://static.usrfiles.com/ugd/4117a9_7aa40203153445f9917cc65d9bd472cf.pdf
- https://static.usrfiles.com/ugd/b8c837_2bab5bcd149f400385cc552708996005.pdf
- https://static.usrfiles.com/ugd/9cfd0a_56b279dfb8044003b6c3853647132144.pdf
- https://static.usrfiles.com/ugd/a6e5e9_577c594e63ba48e7ad186e7c6c3ffe7a.pdf
- https://cdn.shopify.com/s/files/1/0427/5296/6812/files/cell_organelles_quiz.pdf
- https://cdn.shopify.com/s/files/1/0440/0644/1110/files/pexamus.pdf
- https://cdn.shopify.com/s/files/1/0436/9262/1979/files/clsi_antibiograma.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42479515564.pdf
- https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
- https://static.usrfiles.com/ugd/9ff9b8_93fbbe1031ed48e2bddcd1b93a3695bf.pdf
- https://cdn.shopify.com/s/files/1/0431/7180/7392/files/77491527994.pdf
- https://cdn.shopify.com/s/files/1/0429/5580/0732/files/drama_script_on_dowry_system_in_english.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00004a30.bin` `dedd3eb6d21484fa5e028c70f3e03bc85c34c8e1c868508cf338ce28665f24af`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4A30	4904 bytes
`font_01_sfnt_off00005ae3.bin` `f558cae9c41e54c9741c3efa10db51c2612698f8b7889dff86086099c59754b0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5AE3	14320 bytes

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